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import { useState, useEffect, useContext, useRef } from 'react';
// @ts-ignore
import isEqual from 'E:/顺德农商/新建文件夹/umi-test-demo/node_modules/@umijs/plugin-model/node_modules/fast-deep-equal/index.js';
// @ts-ignore
import { UmiContext } from 'E:/顺德农商/新建文件夹/umi-test-demo/node_modules/@umijs/plugin-model/lib/helpers/constant';
import { Model, models } from './Provider';
&nbsp;
export type Models&lt;T extends keyof typeof models&gt; = Model&lt;T&gt;[T]
&nbsp;
export function useModel&lt;T extends keyof Model&lt;T&gt;&gt;(model: T): Model&lt;T&gt;[T]
export function useModel&lt;T extends keyof Model&lt;T&gt;, U&gt;(model: T, selector: (model: Model&lt;T&gt;[T]) =&gt; U): U
&nbsp;
export function <span class="fstat-no" title="function not covered" >useModel&lt;</span>T extends keyof Model&lt;T&gt;, U&gt;(
  namespace: T,
  updater?: (model: Model&lt;T&gt;[T]) =&gt; U
) : typeof updater extends undefined ? Model&lt;T&gt;[T] : ReturnType&lt;NonNullable&lt;typeof updater&gt;&gt;{
&nbsp;
  type RetState = typeof updater extends undefined ? Model&lt;T&gt;[T] : ReturnType&lt;NonNullable&lt;typeof updater&gt;&gt;
  const dispatcher = <span class="cstat-no" title="statement not covered" >useContext&lt;any&gt;(UmiContext);</span>
  const updaterRef = <span class="cstat-no" title="statement not covered" >useRef(updater);</span>
<span class="cstat-no" title="statement not covered" >  updaterRef.current = updater;</span>
  const [state, setState] = <span class="cstat-no" title="statement not covered" >useState&lt;RetState&gt;(</span>
<span class="fstat-no" title="function not covered" >    ()</span> =&gt; <span class="cstat-no" title="statement not covered" >updaterRef.current ? updaterRef.current(dispatcher.data![namespace]) : dispatcher.data![namespace]</span>
  );
  const stateRef = <span class="cstat-no" title="statement not covered" >useRef&lt;any&gt;(state);</span>
<span class="cstat-no" title="statement not covered" >  stateRef.current = state;</span>
&nbsp;
  const isMount = <span class="cstat-no" title="statement not covered" >useRef(false);</span>
<span class="cstat-no" title="statement not covered" >  useEffect(<span class="fstat-no" title="function not covered" >()</span> =&gt; {</span>
<span class="cstat-no" title="statement not covered" >    isMount.current = true;</span>
<span class="cstat-no" title="statement not covered" >    return <span class="fstat-no" title="function not covered" >()</span> =&gt; {</span>
<span class="cstat-no" title="statement not covered" >      isMount.current = false;</span>
    }
  }, [])
&nbsp;
<span class="cstat-no" title="statement not covered" >  useEffect(<span class="fstat-no" title="function not covered" >()</span> =&gt; {</span>
    const handler = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >(e</span>: any) =&gt; {</span>
<span class="cstat-no" title="statement not covered" >      if(!isMount.current) {</span>
        // 如果 handler 执行过程中，组件被卸载了，则强制更新全局 data
<span class="cstat-no" title="statement not covered" >        setTimeout(<span class="fstat-no" title="function not covered" >()</span> =&gt; {</span>
<span class="cstat-no" title="statement not covered" >          dispatcher.data![namespace] = e;</span>
<span class="cstat-no" title="statement not covered" >          dispatcher.update(namespace);</span>
        });
      } else {
<span class="cstat-no" title="statement not covered" >        if(updater &amp;&amp; updaterRef.current){</span>
          const currentState = <span class="cstat-no" title="statement not covered" >updaterRef.current(e);</span>
          const previousState = <span class="cstat-no" title="statement not covered" >stateRef.current</span>
<span class="cstat-no" title="statement not covered" >          if(!isEqual(currentState, previousState)){</span>
<span class="cstat-no" title="statement not covered" >            setState(currentState);</span>
          }
        } else {
<span class="cstat-no" title="statement not covered" >          setState(e);</span>
        }
      }
    }
<span class="cstat-no" title="statement not covered" >    try {</span>
<span class="cstat-no" title="statement not covered" >      dispatcher.callbacks![namespace]!.add(handler);</span>
<span class="cstat-no" title="statement not covered" >      dispatcher.update(namespace);</span>
    } catch (e) {
<span class="cstat-no" title="statement not covered" >      dispatcher.callbacks![namespace] = new Set();</span>
<span class="cstat-no" title="statement not covered" >      dispatcher.callbacks![namespace]!.add(handler);</span>
<span class="cstat-no" title="statement not covered" >      dispatcher.update(namespace);</span>
    }
<span class="cstat-no" title="statement not covered" >    return <span class="fstat-no" title="function not covered" >()</span> =&gt; {</span>
<span class="cstat-no" title="statement not covered" >      dispatcher.callbacks![namespace]!.delete(handler);</span>
    }
  }, [namespace]);
&nbsp;
<span class="cstat-no" title="statement not covered" >  return state;</span>
};
&nbsp;</pre></td></tr></table></pre>

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